------------[ cut here ]------------
WARNING: CPU: 0 PID: 8168 at kernel/rcu/tree_stall.h:898 rcu_check_gp_start_stall.part.0+0x325/0x4b0 kernel/rcu/tree_stall.h:890
Modules linked in:
CPU: 0 PID: 8168 Comm: kworker/u4:6 Not tainted 5.15.0-rc3-next-20211001-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_nc_worker
RIP: 0010:rcu_check_gp_start_stall.part.0+0x325/0x4b0 kernel/rcu/tree_stall.h:898
Code: 0f 88 fa 00 00 00 be 04 00 00 00 48 c7 c7 40 77 26 90 e8 ee 9a 5a 00 b8 01 00 00 00 87 05 83 40 c4 0e 85 c0 0f 85 c9 00 00 00 <0f> 0b 48 81 fd c0 9f 98 8b 48 c7 c3 2c e1 6e 8d 74 58 48 b8 00 00
RSP: 0018:ffffc90000007e30 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 00000001000247af RCX: ffffffff816236b2
RDX: fffffbfff204cee8 RSI: 0000000000000004 RDI: ffffffff90267740
RBP: ffffffff8b989fc0 R08: 0000000000000001 R09: 0000000000000003
R10: fffffbfff204cee8 R11: 0000000000000000 R12: 1ffffffff16c1e30
R13: 0000000000000246 R14: ffff8880b9c3a8d2 R15: 0000000000000008
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb11e359700 CR3: 000000000b68e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 rcu_check_gp_start_stall kernel/rcu/tree_stall.h:861 [inline]
 rcu_core+0x4df/0x1470 kernel/rcu/tree.c:2747
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_preemption_disabled+0x1b/0x140 lib/smp_processor_id.c:16
Code: 0f 1f 44 00 00 0f 0b e9 23 ff ff ff cc cc cc 41 56 41 55 49 89 f5 41 54 55 48 89 fd 53 0f 1f 44 00 00 65 44 8b 25 cd bf ce 76 <65> 8b 1d 5e 1a cf 76 81 e3 ff ff ff 7f 31 ff 89 de 0f 1f 44 00 00
RSP: 0018:ffffc9000adc7a38 EFLAGS: 00000297
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888021a15700 RSI: ffffffff89e44360 RDI: ffffffff89e443a0
RBP: ffffffff89e443a0 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff817e4182 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff89e44360 R14: ffffffff8b981260 R15: ffffc9000adc7b58
 perf_trace_buf_alloc+0x98/0x260 kernel/trace/trace_event_perf.c:411
 perf_trace_lock_acquire+0x180/0x550 include/trace/events/lock.h:13
 trace_lock_acquire include/trace/events/lock.h:13 [inline]
 lock_acquire+0x416/0x510 kernel/locking/lockdep.c:5608
 rcu_lock_acquire include/linux/rcupdate.h:268 [inline]
 rcu_read_lock include/linux/rcupdate.h:694 [inline]
 batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:410 [inline]
 batadv_nc_worker+0x12d/0xfa0 net/batman-adv/network-coding.c:721
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2297
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
----------------
Code disassembly (best guess):
   0:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
   5:	0f 0b                	ud2
   7:	e9 23 ff ff ff       	jmpq   0xffffff2f
   c:	cc                   	int3
   d:	cc                   	int3
   e:	cc                   	int3
   f:	41 56                	push   %r14
  11:	41 55                	push   %r13
  13:	49 89 f5             	mov    %rsi,%r13
  16:	41 54                	push   %r12
  18:	55                   	push   %rbp
  19:	48 89 fd             	mov    %rdi,%rbp
  1c:	53                   	push   %rbx
  1d:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  22:	65 44 8b 25 cd bf ce 	mov    %gs:0x76cebfcd(%rip),%r12d        # 0x76cebff7
  29:	76
* 2a:	65 8b 1d 5e 1a cf 76 	mov    %gs:0x76cf1a5e(%rip),%ebx        # 0x76cf1a8f <-- trapping instruction
  31:	81 e3 ff ff ff 7f    	and    $0x7fffffff,%ebx
  37:	31 ff                	xor    %edi,%edi
  39:	89 de                	mov    %ebx,%esi
  3b:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)